population是一个集体名词,在这句话里面是指人口,请问人口如何被增长?所以选择C
意思：多年来,人口正不断快速增长.
has been doing 表示一般现在完成进行时,表示从过去时间里开始、并持续到现在,一直在进行的(或刚结束的)动作或状态
因此has been growing 表示从多年前人口还是增长,一直增长到现在,也可能增长到将来
所以选择C
for many years,the word population()rapidly
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